Implement IC support for Constant Function transitions.

src/property.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 374 matching lines @@
   }
 
   PropertyDetails GetTransitionDetails() {
     return GetTransitionDetails(holder()->map());
   }
 
   bool IsTransitionToField(Map* map) {
     return IsTransition() && GetTransitionDetails(map).type() == FIELD;
   }
 
+  bool IsTransitionToConstantFunction(Map* map) {
+    return IsTransition() &&
+        GetTransitionDetails(map).type() == CONSTANT_FUNCTION;
+  }
+
   Map* GetTransitionMap() {
     ASSERT(IsTransition());
     return Map::cast(GetValue());
   }
 
   Map* GetTransitionMapFromMap(Map* map) {
     ASSERT(IsTransition());
     return map->transitions()->GetTarget(number_);
   }
 
@@ skipping 82 matching lines @@
   JSReceiver* holder_;
   int number_;
   bool cacheable_;
   PropertyDetails details_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_PROPERTY_H_